Adaptec SAS RAID Controllers Installationsanleitung Seite 115
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Appendix F Selecting the Best RAID Level 101
RAID 60 Arrays
Similar to a RAID 50 array (see “RAID 50 Arrays” on page 98), a RAID 60
array—also referred to as dual drive failure protection— is built from at least eight disk
drives configured as two or more RAID 6 arrays, and stripes stored data and two sets
of parity data across all disk drives in both RAID 6 arrays.
Two sets of parity data provide enhanced data protection, and striping improves
performance. RAID 60 arrays also provide high data transfer speeds.
Selecting the Best RAID Level
Use this table to select the RAID levels that are most appropriate for the arrays on
your storage space, based on the number of available disk drives and your
requirements for performance and reliability.
Disk drive usage, read performance, and write performance depend on the number
of drives in the array. In general, the more drives, the better the performance.
TABLE F-1 Selecting the Best RAID Level
RAID Level Redundancy
Disk Drive
Usage
Read
Performance
Write
Performance
Built-in
Hot-Spare
Minimum
Disk Drives
RAID 0 No 100% www www No 2
RAID 1 Yes 50% ww ww No 2
RAID 1E Yes 50% ww ww No 3
RAID 10 Yes 50% ww ww No 4
RAID 5 Yes 67 – 94% www w No 3
RAID
5EE
Yes 50 – 88% www w Yes 4
RAID 50 Yes 67 – 94% www w No 6
RAID 6 Yes 50 – 88% ww w No 4
RAID 60 Yes 50 – 88% ww w No 8
- Sun StorageTekSAS RAID HBA 1
- Contents 3
- ▼ To View the Event Log 78 8
- Contents ix 9
- Declaration of Conformity 115 10
- Index 131 10
- Before You Read This Document 11
- Related Documentation 12
- Training 13
- Documentation Comments 13
- HBA Overview 15
- HBA Features 16
- Component Layout 17
- Requirements 19
- System Interoperability 20
- Server Support 21
- Software Support 21
- Observing ESD and Handling 23
- Precautions 23
- Installation Task Map 26
- ■ ESD wrist strap 28
- SPARC System 30
- Installing the HBA 31
- Connecting Disk Drives 33
- Testing the HBA Installation 34
- No Logical Drives Found 38
- Next Steps 39
- Removing the Hardware 39
- ▼ To Remove the HBA 40
- Creating an Array 42
- Making the Array Bootable 45
- Setting the Boot HBA 45
- Install the Solaris OS 48
- ▼ To Create a Logical Drive 49
- # ./arcconf GETCONFIG 1 LD 51
- # devfsadm 51
- Array on an x64 System 53
- Preparing to Install an OS 54
- ■ “Next Steps” on page 47 59
- Installing the Solaris OS 60
- Operating System 63
- Linux OS 64
- Known Issues 67
- BIOS Utility Issues 68
- Performance Issues 68
- Chapter 8 Known Issues 55 69
- Configuration Rules 71
- ■ Maximum length of 1 meter 72
- HBA Specifications 73
- Environmental Specifications 74
- DC Power Requirements 74
- Current Requirements 74
- Performance Specifications 74
- Connector Pin Definitions 75
- SATA Pin-Out 76
- SATA Power Pin-Out 77
- Introduction to the BIOS RAID 80
- Configuration Utility 80
- Hot-Plug Addition Conditions 81
- Conditions 81
- ▼ To Start the ACU 84
- ■ Delete an array 85
- Settings 87
- General HBA Settings 88
- Select Utility 89
- Utilities 90
- ▼ To View the Event Log 92
- Troubleshooting 93
- Silencing the Alarm 94
- Appendix D Troubleshooting 81 95
- Best Practices 97
- Making New Connections 98
- Enclosures 99
- Failure Conditions 99
- Failures 100
- Discovering Drives 101
- Order of Logical Drives 101
- RAID Logical Devices 102
- Appendix E Best Practices 89 103
- Selecting the Best RAID Level 105
- Understanding Drive Segments 106
- Nonredundant Arrays (RAID 0) 106
- RAID 1 Arrays 107
- RAID 1 Enhanced Arrays 108
- RAID 10 Arrays 109
- RAID 5 Arrays 110
- RAID 5EE Arrays 111
- RAID 50 Arrays 112
- RAID 6 Arrays 114
- RAID 60 Arrays 115
- Migrating RAID Levels 116
- APPENDIX 117
- About SAS 118
- About Phys 119
- About SAS Ports 120
- About SAS Addresses 120
- About SAS Connectors 121
- About SAS Cables 121
- About SAS Connection Options 122
- SAS Expander Connections 123
- Declaration of Conformity 129
- Safety Precautions 131
- Battery Warning 132
- System Unit Cover 133
- Rack System Instructions 133
- Laser Compliance Notice 133
- CD and DVD Devices 133
- Mesures de sécurité 133
- Symboles 134
- Modification du matériel 134
- Conformité SELV 134
- Couvercle de l'unité 135
- Périphériques CD et DVD 135
- Vorschriften 136
- Anschluss des Netzkabels 137
- Warnung bezüglich Batterien 137
- Gehäuseabdeckung 137
- Anweisungen zur Rack-Montage 137
- Normativas de seguridad 138
- Class 1 Laser Product 140
- Luokan 1 Laserlaite 140
- Klasse 1 Laser Apparat 140
- Laser Klasse 1 140
- FCC Class B Notice 143
- GOST-R Certification Mark 144
- Index 133 147
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